LG LX400 - Manual (Page 162)

148 Section 3B: Sprint Vision
Can I sign out of data services?
You can sign out without turning off your phone;
however, you will not be able to browse the Web or use
other Sprint Vision services. While signed out, you can
still place or receive phone calls, check voicemail, and
use other voice services. You may sign in again at any
time. To sign out, go to
Settings > More ... > Data> On/Off in
your phone’s menu.
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